Comparing APR Across Currencies: A Practical Framework for TAE, CAT, TCEA, DAE, CFT, and CAE

Every market this site covers has its own legally mandated annualized cost figure for consumer credit — TAE in Spain, CAT in Mexico, Tasa EA in Colombia, TCEA in Peru, DAE in Romania, CAE in Chile, and CFT in Argentina — and every one of them exists for the same underlying reason: forcing lenders to disclose interest plus mandatory fees as a single, comparable annualized percentage rather than letting them advertise a flattering flat fee that hides the true cost. That shared purpose, however, does not mean the seven figures are directly interchangeable across borders, and treating them as if they were is the single most common mistake in cross-market research.

The first source of divergence is calculation methodology. TAE (Spain) and DAE (Romania) both follow the EU's harmonized formula under Directive 2008/48/EC, making them genuinely comparable to each other in a way no other pair on this list is. CAT (Mexico) uses Banxico's own methodology, and for short fintech loans is commonly calculated by simply multiplying a declared daily rate by 365 — a convention that produces a very specific, very common reference figure (around 365%) across the active Mexican market. TCEA (Peru), regulated by the SBS, can in fact be calculated on a slightly different basis between traditional banks and certain fintech structures depending on licensing, meaning two Peruvian apps quoting TCEA for a similar loan are not guaranteed to be using an identical formula.

The second source of divergence is structural, not mathematical: legal ceilings. Colombia's Tasa EA is capped by a "tasa de usura," a maximum rate set periodically by the Superintendencia Financiera de Colombia that no lender, bank or fintech, may legally exceed — a hard structural ceiling with no equivalent in Spain, Mexico, Peru, or Chile's frameworks for this product category. This is why Colombian short-term loans routinely show more moderate headline rates than otherwise-similar products in neighboring markets: it is not that Colombian lenders are less profit-motivated, it is that the law caps how high the number can legally go.

The third, and often largest, source of divergence is macroeconomic, and it is why Argentina's CFT cannot be read the same way as the other six. Argentina's persistent inflation means the BCRA's benchmark rate — and consequently CFT across the entire lending market — sits at a different order of magnitude than the equivalent figure in lower-inflation markets, because lenders must price in expected currency depreciation to protect the real value of a fixed peso repayment. A CFT figure several multiples higher than a comparable Chilean CAE or Peruvian TCEA is not necessarily evidence of a more predatory Argentine lender; it can equally reflect a genuinely higher-inflation currency environment.

Given these three sources of divergence — formula, legal ceiling, and macroeconomic base rate — the only sound way to compare a loan cost across two different countries is to convert every offer to the same underlying question: what is the total amount repayable, in a common reference currency, for a loan of a specific size and term? A €300 Spanish microcrédito repaid in 30 days and a similarly sized Mexican SOFOM loan repaid over the same term can be compared reliably in euros once both are converted, even though their TAE and CAT figures alone cannot be compared directly given the differing methodologies behind them.

The practical framework, then, is: first, confirm which of the three divergence sources applies to the pair of markets being compared (EU-harmonized formula, a usury ceiling, or an inflation-driven base rate); second, never compare a headline percentage across currencies without converting to a common currency and fixing the loan amount and term; and third, treat any percentage in the high hundreds or low thousands as the expected norm for this specific short-duration product category everywhere it is offered, not as a red flag unique to one country. Applied consistently, this framework lets a genuinely international borrower or researcher compare Spain, Mexico, Colombia, Peru, Romania, Chile, and Argentina on equal footing, which no single country's TAE, CAT, or CFT figure can do on its own.